<template>
    <el-container class="home-container">
        <!-- 头部区域 -->
        <el-header>
            <div>
                <img src="../assets/heima.png" alt="">
                <span>电商管理系统</span>
            </div>
            <el-button type="danger" @click="logout"> 退出 </el-button>
        </el-header>
        <!-- 页面主体区域 -->
        <el-container>
            <!-- 侧边栏 -->
            <el-aside :width="isCollapse ? '64px' : '200px'">
                <div class="toggle-button" @click="toggleCollapse"> ||| </div>
                <!-- 侧边栏菜单区 -->
                <el-menu
      background-color="#373d41"
      text-color="#fff"
      active-text-color="yellow" unique-opened :collapse="isCollapse" :collapse-transition="false" :router="true" :default-active="activePath">
      <!-- 一级菜单 -->
      <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
          <!-- 一级菜单的模板区域 -->
        <template slot="title">
            <!-- 图标 -->
          <i :class="iconsObj[item.id]"></i>
          <!-- 文本 -->
          <span>{{item.authName}}</span>
        </template>
        <!-- 二级菜单 -->
        <el-menu-item :index="'/' + subItem.path " v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/' + subItem.path)">
            <template slot="title">
            <!-- 图标 -->
          <i class="el-icon-menu"></i>
          <!-- 文本 -->
          <span>{{subItem.authName}}</span>
        </template>
        </el-menu-item>
      </el-submenu>
    </el-menu>
            </el-aside>
            <!-- 右侧内容主题 -->
            <el-main>
                <router-view></router-view>
            </el-main>
        </el-container>
    </el-container>
</template>
<script>
export default {
    data() {
        return {
            // 左侧菜单数据
            menulist: [],
            iconsObj: {
                '125': 'iconfont icon-user',
                '103': 'iconfont icon-tijikongjian',
                '101': 'iconfont icon-shangpin',
                '102': 'iconfont icon-danju',
                '145': 'iconfont icon-baobiao'
            },
            // 定义是否折叠
            isCollapse: false,
            // 被激活的链接地址
            activePath: ''
        }
    },
    created() {
        this.getMenuList()
        this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
        logout() {
            // 利用clear把登入按钮带来的token清空
        window.sessionStorage.clear()
        // 跳转到登入页面
        this.$router.push('/login')
        },
        // 获取所有的菜单
        async getMenuList() {
          const { data: res } = await this.$http.get('menus')
          if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
          this.menulist = res.data
        },
        // 点击按钮切换菜单的展开与折叠
        toggleCollapse() {
            this.isCollapse = !this.isCollapse
        },
        saveNavState(activePath) {
            window.sessionStorage.setItem('activePath', activePath)
            this.activePath = activePath
        }
    }
}
</script>
<style lang="less" scoped>
.home-container {
    height: 100%;
}
.el-header {
    background: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center ;
    color: #fff;
    font-size:20px ;
    > div {
        display: flex;
        align-items: center ;
        span {
            margin-left:15px
        }
    }
}
.el-aside {
    background: #333744;
    .el-menu {
       border-right: none;
    }
}
.el-main {
    background: #EAEDF1;
}
.iconfont {
    margin-right: 10px;
}
.toggle-button {
    background-color: #4A5064;
    font-size: 12px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
}
</style>